The L⁄, a⁄ and b⁄ values of potato and apple puree blended with
RBE, CDRBE and DW after storage at 25 C for 1–6 h are shown inFig. 1. Generally, the high browning color in fruit and vegetable
products is indicated by the decrease of L⁄ values and the increase
of a⁄ values. The results indicate that L⁄ values of potato and
apple puree for all treatments decreased with time; however, the
changes of L⁄ of potato and apple puree treated with both extracts
exhibited significantly higher L⁄ values than that treated with DW
throughout the storage time (p 6 0.05). Potato and apple puree
treated with RBE showed the lowest browning color compared
with the other treatments (p 6 0.05). The a⁄ value of potato and
apple puree treated with RBE was significantly lower than those
treated with CDRBE and DW throughout the storage time
(p 6 0.05). The b⁄ value of potato puree treated with RBE was significantly
higher than those treated with CDRBE and DW
(p 6 0.05), whereas the b⁄ value of apple puree treated with RBE
was similar to the other treatments. RBE showed the most potent
inhibitory effect on browning in potato puree during storage.